10.1371/journal.pone.0175499.g001 Wei Yin Wei Yin Kevin Clare Kevin Clare Qiujia Zhang Qiujia Zhang Nora D. Volkow Nora D. Volkow Congwu Du Congwu Du Normalized plasma NO concentration in control rats and cocaine-treated rats. Public Library of Science 2017 microvascular density blood vessel constriction brain regions HIF-VEGF pathway activation nucleus accumbens nitric oxide synthase NOS middle prefrontal cortex increase microvascular density cocaine ELISA VEGF expression dorsal striatum Cerebral microvascular density 2017-04-27 19:25:48 Figure https://plos.figshare.com/articles/figure/Normalized_plasma_NO_concentration_in_control_rats_and_cocaine-treated_rats_/4927928 <p>“2W” stands for “2 weeks”, and “4W” stands for “4 weeks”. All data was normalized to the average plasma NO concentration of 2-week control rats. Data is presented as mean + standard error (n = 4–9).</p>